Measurement Modes - ABB RELION REX640 Technical Manual

Section 5
Protection related functions
5.7.6
1118
0
Low alarm
Dis limit
GUID-5225832D-55E1-45F9-AB13-5FE85E4FE525 V1 EN
Figure 608: An example of the ALARM output use
Recorded data
All the information required for a later fault analysis is recorded to SCEFRFLO
recorded data. In the protection relay, recorded data is found in Monitoring/
Recorded data/Other protection/SCEFRFLO.
SCEFRFLO has also monitored data values which are used for the readout of
continuous calculation values.
are available as continuous monitoring values during a fault.
Table 1049: Recorded and monitored data values
Recorded data
Flt loop
Flt distance
Flt Dist quality
Flt loop resistance
Flt loop reactance
Flt phase reactance
Flt point resistance
Flt to Lod Cur ratio
Equivalent load Dis
XC0F Calc

Measurement modes

The full operation of SCEFRFLO requires that all three phase-to-earth voltages are
measured. The voltages can be measured with conventional voltage transformers or
voltage dividers connected between the phase and earth (VT connection is set to
"Wye"). Another alternative is to measure phase-to-phase voltages (VT connection is
Distance
High alarm
Dis limit
Table 1049 shows which of the recorded data values
Monitored data
FAULT_LOOP
FLT_DISTANCE
FLT_DIST_Q
RFLOOP
XFLOOP
XFPHASE
RF
IFLT_PER_ILD
S_CALC
XC0F_CALC
1MRS759142 C
REX640
Technical Manual